A simple pendulum has time period T1. The point of suspension is now moved upward according to the relation y = Kt², (K = 1 m s⁻²) where y is the vertical displacement. The time period now becomes T2. The ratio of T2:T1 is (Take g = 10 m s⁻²)

A. 6/5
B. 5/6
C. 1/2
D. 4/5